CHICAGO | St. Regis Chicago (Vista) | 1,191 FT | 101 FLOORS - Page 91

KWILLSKYLINE · #**1801** Posted **Oct 8, 2016, 10:28 AM**

^^^the jungle of drilling. Love it.

City Wide · #**1802** Posted **Oct 9, 2016, 3:46 AM**

Quote:

Originally Posted by LouisVanDerWright

Notice how you never just see a giant cassion sleeve like the ones delivered the other day just sticking 3/4 of the way out of the ground? You will never see that because the equipment couldn't possibly work with a 100' long sleeve all at once. What they do is drill in a 22' wide by 25' long one, then lower a 50' long by 21' 3" sleeve into the existing hole so only 25' is sticking out. Then they telescope that one all the way into the hole and then they bring out a 75' long by 20' 6" one and drill that all the way in. THEN comes the big boy which is say 20' even wide and 100' long and drill that all the way down. Once they've "telescoped" to the right depth they bust out the rock grinders, make their socket, and then lower a all the way into the hole with the rebar cage in the middle a pour away.

I actually wondered about that a long time myself, how do they keep reusing the sleeves? How do they get them out? Why do you never see a super long one just like halfway drilled into the ground? Then I watched them working at this site the other day and saw them dropping a medium sized one into a larger hole and was like "gotcha". I suggest going down to watch this site, it's immensely impressive. Watching a rig like this torque the big sleeves that have hundreds of square feet of surface area against thick Chicago mud is quite a sight.

Lets see if I've got this right----drive a large diameter sleeve into the ground as deep as possible. (I assume that the friction between the sleeve and the ground limits the depth of this drive, bigger diameter=more surface area rubbing against the sleeve=shorter depth, small diameter = less friction = greater depth) then drill and remove the debris from the center of the first sleeve. Repeat these steps with a slightly narrower sleeve but of course it will drive deeper since the top section is not in contact with any dirt.
Then at some point in time a "permanent galvanized corrugated sleeve" is put in the full depth hole, a rebar cage is fit into the permanent sleeve which gets filled up with concrete.
Question, I've only ever seen this type of caisson construction done with 2 sleeves. Is this because 2 sleeves gets one down 100' or so, but if needed this principal of what you call telescoping could be done with as many sleeves as needed.
I have never seen a "permanent galvanized corrugated sleeve" why bother with the cost of galvanizing and corrugating? This last sleeve is just a form for the concrete, rust won't be a problem.
I assume that the reason for adding this permanent sleeve/concrete form/ and not just leaving the drilling sleeves in place must be cost. The drilling sleeves look major league compared to the permanent sleeve
After the permanent sleeve is filled, or maybe as it is being filled, are the drilling sleeves removed and the space they took up backfilled with dirt or grout?

vexxed82 · #**1803** Posted **Oct 11, 2016, 3:54 PM**

Thanks everyone!

Quote:

Originally Posted by Steely Dan

^ outstanding pics!

Quote:

Originally Posted by intrepidDesign

Bad ass dude. Thanks and keep em coming!

Quote:

Originally Posted by excel

That drill is nuts!

P.S. I reached out to Case to see if they need any photo work, but as a side note, I asked my contact about how exactly the below drill bit worked. He pointed me to Center Rock, Inc's LP Drill. If you're interested in seeing an animation on how these drills work at depth, click on the View Product Video button on the LP Drill product page.

harryc · #**1804** Posted **Oct 11, 2016, 4:08 PM**

Quote:

Originally Posted by vexxed82

...snip...
Center Rock, Inc's LP Drill. If you're interested in seeing an animation on how these drills work at depth, click on the View Product Video button on the LP Drill product page.
...snip...

Great link -tyvm. I had always assumed the little heads rotated, looks like they pound instead.

KWILLSKYLINE · #**1805** Posted **Oct 12, 2016, 2:37 AM**

Glad they went with the Sonic the Hedgehog soundtrack.

BVictor1 · #**1806** Posted **Oct 12, 2016, 3:10 AM**

10/11/16

KWILLSKYLINE · #**1807** Posted **Oct 12, 2016, 12:40 PM**

Cool mini time-lapse BVic.

harryc · #**1808** Posted **Oct 16, 2016, 2:01 PM**

Oct 08

For holding the rebar in just the right spot ?

SolarWind · #**1809** Posted **Oct 16, 2016, 11:05 PM**

October 13, 2016

Skyguy_7 · #**1810** Posted **Oct 17, 2016, 12:44 PM**

From BCBS tower 10/15. Vista action is at the bottom right.

Mr Downtown · #**1811** Posted **Oct 17, 2016, 1:37 PM**

^View was better from Aon. I spent the whole weekend pointing the construction site out to people who asked. I was surprised how much this project was known to the general public, at least the OHC crowd.

BrandonJXN · #**1812** Posted **Oct 17, 2016, 1:46 PM**

Off topic a bit but Swisshotel is begging for a green roof.

Mr Downtown · #**1813** Posted **Oct 17, 2016, 3:18 PM**

Lots of details are (deliberately) obscure, but the Sun-Times is reporting that former mayor Richard M. Daley and his son Patrick have structured an enterprise to allow Chinese investors to buy green cards by investing in this project and/or Site O. To allow investment of only $500K rather than $1M, they claimed the project was in an area of high unemployment, by stitching together this perfectly logical "community:"

KWILLSKYLINE · #**1814** Posted **Oct 17, 2016, 3:22 PM**

Quote:

Originally Posted by BrandonJXN

Off topic a bit but Swisshotel is begging for a green roof.

Thats up to Bruce Wayne.

the urban politician · #**1815** Posted **Oct 17, 2016, 4:26 PM**

Quote:

Originally Posted by Mr Downtown

Lots of details are (deliberately) obscure, but the Sun-Times is reporting that former mayor Richard M. Daley and his son Patrick have structured an enterprise to allow Chinese investors to buy green cards by investing in this project and/or Site O. To allow investment of only $500K rather than $1M, they claimed the project was in an area of high unemployment, by stitching together this perfectly logical "community:"

Wow! That is an embarrassing gerrymander.

I might have to tap the EB-5 program myself some day before they shut it down

photoLith · #**1816** Posted **Oct 17, 2016, 5:07 PM**

Im not getting too excited yet about this tower, dont want to get my hopes up for yet another Chicago Spire situation.

the urban politician · #**1817** Posted **Oct 17, 2016, 5:15 PM**

Quote:

Originally Posted by photoLith

Im not getting too excited yet about this tower, dont want to get my hopes up for yet another Chicago Spire situation.

Once again, too many fools just don't have a clue how vastly different this is.

It's as if Chicago stopped being able to support 1000+ footers because one novice with little experience and virtually no money couldn't pull off the tallest project in the Western Hemisphere right on the cusp of a monumental credit meltdown.

SamInTheLoop · #**1818** Posted **Oct 17, 2016, 6:35 PM**

Quote:

Originally Posted by Mr Downtown

Lots of details are (deliberately) obscure, but the Sun-Times is reporting that former mayor Richard M. Daley and his son Patrick have structured an enterprise to allow Chinese investors to buy green cards by investing in this project and/or Site O. To allow investment of only $500K rather than $1M, they claimed the project was in an area of high unemployment, by stitching together this perfectly logical "community:"

Saw this article over the weekend as well.
EB-5 is an absolute scandal and imo should not be reformed - it should be outright scrapped.

Zerton · #**1819** Posted **Oct 17, 2016, 7:46 PM**

^But without it would the city get many less skyscrapers built with foreign investment?

Zerton · #**1820** Posted **Oct 17, 2016, 7:47 PM**

Is there any way to update the title image? The new design is so much better than that dated one.